This 20W amplifier was found in 283 circuits from the 90s. The MOSFET admits equivalents. The power supply must be dual, and the transistors must be mounted on good heat sinks.
This circuit uses two operational amplifiers, which can be of the type 741, in a full wave...
The frequency of this oscillator depends on the coil and capacitors C1 and C2. For 1 MHz L1 is...
This circuit monitors extra-low frequency (ELF) fields. We found it in an American documentation from the...